Highly sensitive volatile organic compounds vapour measurements using a long period grating optical fibre sensor coated with metal organic framework ZIF-8
| Autor: | Stephen P. Morgan, Jiri Hromadka, Sergiy Korposh, Ricardo Correia, Begum Tokay |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Analytical chemistry 02 engineering and technology engineering.material Grating Volatile organic compounds (VOCs) sensor 010402 general chemistry 01 natural sciences Long period grating (LPG) law.invention Acetone chemistry.chemical_compound Metal organic framework (MOF) Coating law Materials Chemistry Volatile organic compound Electrical and Electronic Engineering Crystallization Instrumentation Detection limit chemistry.chemical_classification Ethanol Methanol Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry engineering Metal-organic framework 0210 nano-technology ZIF-8 |
| ISSN: | 0925-4005 |
| Popis: | An optical fibre long period grating (LPG) based volatile organic compound (VOC) sensor coated with ZIF-8, a material from the zeolite imidazolate framework (ZIF) family, functional coating is presented. ZIF-8 film was deposited onto the surface of the LPG using an in-situ crystallization technique by mixing freshly prepared 12.5 mM zinc nitrate hexahydrate and 25 mM 2-metyl-imidazole solutions in methanol. A concentration specific response to acetone, ethanol and methanol vapour was obtained over the high concentration range up to tens thousands ppm. The LPG based sensor works at phase-matching turning point (PMTP) and such operates at the highest sensitivity. A novel approach for the data analysis based on the measurement of the bandwidth of the U-shaped attenuation band of the LPG is introduced. The optimized sensor shows a sensitivity of 0.015 ± 0.001 and 0.018 ± 0.0015 nm/ppm and limit of detection (LOD) of 6.67 and 5.56 ppm for acetone and ethanol respectively. |
| Databáze: | OpenAIRE |
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